separate trie from util and make its dependencies into libs:

* bytes
* hashdb
* memorydb
* nibbleslice
* nibblevec

ethcore/vm/src/action_params.rs

@@ -17,7 +17,8 @@
 //! Evm input params.
 use bigint::prelude::U256;
 use bigint::hash::{H256};
-use util::{Address, Bytes};
+use util::Address;
+use bytes::Bytes;
 use hash::{keccak, KECCAK_EMPTY};
 use ethjson;
 

ethcore/vm/src/error.rs

@@ -16,7 +16,7 @@
 
 //! VM errors module
 
-use util::trie;
+use trie;
 use std::fmt;
 
 /// VM errors.

ethcore/vm/src/ext.rs

@@ -20,6 +20,7 @@ use std::sync::Arc;
 use bigint::prelude::U256;
 use bigint::hash::H256;
 use util::*;
+use bytes::Bytes;
 use call_type::CallType;
 use env_info::EnvInfo;
 use schedule::Schedule;

ethcore/vm/src/lib.rs

@@ -18,10 +18,12 @@
 
 extern crate ethcore_util as util;
 extern crate ethcore_bigint as bigint;
+extern crate ethcore_bytes as bytes;
 extern crate common_types as types;
 extern crate ethjson;
 extern crate rlp;
 extern crate hash;
+extern crate trie;
 
 mod action_params;
 mod call_type;

ethcore/vm/src/tests.rs

@@ -19,7 +19,8 @@ use std::collections::{HashMap, HashSet};
 
 use bigint::prelude::U256;
 use bigint::hash::H256;
-use util::{Address, Bytes};
+use util::Address;
+use bytes::Bytes;
 use {
 	CallType, Schedule, EnvInfo,
 	ReturnData, Ext, ContractCreateResult, MessageCallResult,